When does it make sense to refinance if rates only drop half a percent?

Forget old rules like needing a full 1% drop — what matters is your break-even. Divide your total refinance closing costs by the monthly payment savings to get the number of months to recoup, then compare that to how long you'll keep the home. On a large loan balance, even a 0.5% drop can save enough monthly to break even in two to three years, making it worthwhile if you're staying put. On a small balance, the same drop may take too long. Also weigh whether you're resetting the clock on a 30-year term. Run your specific numbers at wealthserene.com/tools/refinance-analyzer, which factors closing costs, remaining term, and your time horizon rather than a blanket rate-drop rule.